Effects of a lagoon on performances of a freshwater fishpond in a multi-trophic aquaculture system

Open Access

Table 2

Mean weight and Fulton's condition factor (K) determined using individual measurements by fishpond, treatment, and fish species at stocking and harvest.

	Treatment	Semi-intensive coupled					Semi-intensive					Extensive

	Replicate	1		2		Mean	1		2		Mean	1		2		Mean

Mean indicator		Mean	N²	Mean	N²		Mean	N²	Mean	N²		Mean	N²	Mean	N²		RSE³	Significance⁴
Weight at stocking (g)	Carp	7.3	100	–	–		7.7	100	–	–		–	–	–	–		3.65	NS
	Roach	35.4^a	30	37.4^a	30	36.4^A	47.1^a	30	41.1^a	30	44.1^AB	76.0^b	17	32.9^a	17	54.5^B	29.0	F^*, T^
	Perch	11.0	10	10.6	10	10.8	10.6	10	11.2	10	10.9	10.6	5	10.5	5	10.6	2.0	NS
K at fish stocking	Carp	2.66	100	–	–		2.62	100	–	–		–	–	–	–		0.28	NS
	Roach	1.45^ab	30	1.46^ab	30	1.45^A	1.41^a	30	1.44^a	30	1.43^A	1.56^b	17	1.47^ab	17	1.51^B	0.13	F^, T^
	Perch	1.20	10	1.26	10	1.22	1.24	10	1.22	10	1.23	1.25	5	1.18	5	1.21	0.07	NS
Weight at harvest (g)	Carp	182.7^a	107	185.7^ac	113	184.3^A	233.4^b	123	210.6^bc	115	222.4^B	98.2^d	105	111.5^d	102	104.7^C	84.5	F^, T^
	Roach fry¹	4.9^a	138	3.3^b	251	3.9^A	2.1^c	150	1.4^d	103	1.8^B	3.6^b	150	16.6^e	7	4.2^A	1.8	F^, T^
	Roach	87.3^a	58	112.4^b	53	99.3^A	85.4^a	52	84.9^a	52	85.2^B	85.8^a	26	114.7^b	30	101.3^A	35.4	F^, T^
	Perch	79.7^a	4	94.0^a	7	88.8	126.2^b	10	72.6^a	9	100.8	81.3^a	3	104.1^ab	4	94.3	19.2	F^**
K at harvest	Carp	2.63^a	107	2.68^a	113	2.65^A	2.64^a	123	2.72^a	115	2.68^A	2.38^b	105	2.47^b	102	2.42^B	0.28	F^, T^
	Roach fry¹	1.29^a	138	1.21^c	251	1.24^A	1.18^bc	150	1.15^b	103	1.17^B	1.21^c	150	1.33^ac	7	1.22^A	0.15	F^, T^
	Roach	1.59	58	1.61	53	1.60	1.58	52	1.66	52	1.57	1.60	26	1.65	30	1.63	0.19	NS
	Perch	1.46^ab	4	1.44^b	7	1.45	1.62^a	10	1.41^b	9	1.52	1.42^b	3	1.43^b	4	1.43	0.10	F^**

¹Number of roach fry indicated for the coupled treatment represents fish harvested from the fishpond and from the lagoon.

²Number of individuals sampled to estimate values for the population in each treatment.

³Residual Standard Error.

⁴Significance levels: **: p < 0.01, *: p < 0.05, NS: Not Significant, F = Fishpond, T = treatment. Means on the same line followed by the same letter (lower or upper case) do not differ significantly (p < 0.05).

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